Add a group as AdminCc when create ticket using API

Hi,

I’m using RT 3.8.4. I’m following REST - Request Tracker Wiki to create a ticket but have an issue with it:
I’m trying to create a ticket specifying a group into AdminCc value, with no luck.

I’m sending POST request with these values:

Queue: SomeQueue
Requestor: someuser@company.net
Subject: Test ticket create API
AdminCc: SomeGroup
Text: This is a test message

The ticket is created, but the SomeGroup group is not added to AdminCc. Also, I try by adding the email of the group to AdminCc but still no luck.

Queue: SomeQueue
Requestor: someuser@company.net
Subject: Test ticket create API
AdminCc: somegroup@company.net
Text: This is a test message

Could you please advise me on how can I add a group (or even better, more than one) to ticket creation?

Thank you!